Lock stem valves



- A. SEMON Oct. 28, 1969 I LOCK STEM VALVES Filed April 15, 1966 2 SheetsSheet l INVENTOR ALBERT L.SEMON a.

V ATTORNEY United States Patent 3,475,005 LOCK STEM VALVES Albert L. Semon, 11 Eliot Place, Short Hills, NJ. 07078 Filed Apr. 13, 1966, Ser. No. 542,280 Int. Cl. F16k 35/00, 31/50, /04

US. Cl. 251-111 4 Claims ABSTRACT OF THE DISCLOSURE This invention relates to valves and particularly to a device for locking the valve stem in any adjusted position.

It is an object of the invention to provide a locking device wherein it is not necessary to hold the valve stem when adjusting said locking device.

It is another object of the invention to readily set the valve in any position from close to open.

Other objects and advantages of the invention will be set forth in the detailed description of the invention.

In the drawings accompanying and forming a part of this application:

FIGURE 1 is an exploded view of the locking device, valve stem and valve member;

FIGURE 2 is an elevational view in section showing the valve in open position;

FIGURE 3 is a sectional view taken on the line 33 of FIGURE 2 looking in the direction of the arrows and showing the valve in close position;

FIGURE 4 is a sectional view taken on the line 44 of FIGURE 3 looking in the direction of the arrows with the inlet portion of the valve casing partly broken away;

FIGURE 5 is a sectional view in elevational and on an enlarged scale of a bonnet and a packing nut; and

FIGURE 6 is a plan view looking from the line 6-6 of FIGURE 5 in the direction of the arrows.

The embodiment of the invention comprises a casing 7 having an inlet port 8 arranged with a valve seat 9 and an outlet port 10, both ports being adapted to be connected in a pipe line, not shown, as by screw-threads 11. A chamber 12 is interposed between the inlet and outlet ports 8 and 10, respectively, said chamber 12 being in alignment with the inlet port 8 and opening to the upper part of the casing 7 and provided with screw-threads 13.

An adaptor or bonnet 14 is mounted in the chamber 12 by screw-threads engaging the screw-threads 13 and arranged with an annular beveled face mating with a corresponding beveled face on the opening of the chamber 12 to form a fluid seal, as shown at 15, together with screw-threads 13. The bonnet 14 is provided above the seal 15 with a hexagonal shoulder 16, as shown in FIG- URE 6, for the engagement of a suitable wrench in assembling the valve. The bonnet 14 is provided with a cylindrical recess 17 having screw-threads for the adjustable mounting of a valve member comprising a nose 18 provided with a tapered end portion 19 to engage the valve seat 9. The nose 18 is extended from the closed end of a cylindrical portion 20, said closed end having a lateral-annular flange 21 to limit the opening movement of the valve member, as shown in FIGURE 2. The exterior surface of the cylindrical portion 20 is arranged with screw-threads 22 to engage the screw-threads of the cylindrical recess 17 whereby rotation of the valve member imparts longitudinal movement to the valve member 3,475,005 Patented Oct. 28, 1969 toward and away from the valve seat 9. A pin 23 is secured at its opposite ends in diametrically opposite wall portions of the cylindrical portion 20 to extend transversely of the bore of said cylindrical portion 20.

Rotation is imparted to the valve member by a valve stem comprising an intermediate portion 24 having an end portion 25 of reduced diameter slidable in the bore the cylindrical portion 20 of the valve member and provided with a longitudinal slot 26 to ride on the pin 23. The opposite end portion of the valve stem is also of reduced diameter and arranged with knurls, as at 27 in FIGURES 1 and 2, for locking engagement with the bore of a manipulating knob 29. Below the knob 29, there is provided a beveled shoulder 30 for contacting a corresponding surface 31 arranged in an opening in a cap member or locking device 32 having internal screw-threads 33 on the skirt thereof for adjustably mounting the locking device on an annular extension 34 projecting from the top of the bonnet 14. An O-ring 35 is mounted on the valve stem portion 24 between an annular flange 36 on said stern portion 24 and an annular seat 37 in the top of the bonnet 14 within the annular extension 34. A packing nut 38 is adjustably mounted in the annular extension 34 by screw-threads 39 to abut the valve stem shoulder 36 and said packing nut 38 is arranged with an annular flange 40 above the screw-threads 39 to abut the top of the annular extension 34 and limit the pressure exerted on the O-ring 35 through the valve stem shoulder 36 while maintaining the O-ring 35 in pressure sealing condition. The packing nut 38 is arranged with opposite flats 38' for the engagement of a suitable tool to tighten said packing nut.

When it is desired to adjust the valve member 18-22, the locking device 31-33 is adjusted to disengage the beveled surface 31 of the locking device from the beveled shoulder 30 of the valve stem 24-27, as shown in FIG- URE 3. When the valve member 18-22 is adjusted to the desired position, the locking device 31-33 is adjusted to contact the beveled surface 31 with the beveled shoulder 30 which will exert a pressure on the valve stem 24-27 in the direction toward the O-ring 35 and the valve seat 9 to force the valve stem flange 36 into locking engagement with the O-ring 35 and lock the valve stem 24-27 against rotation by the knob 29, as shown in FIGURES 2 and 4.

Having thus described my invention, I claim:

1. In a lock stern valve, a casing having inlet and outlet ports, a valve seat between the inlet and outlet ports, a valve member operatively supported by the casing to have rotary and longitudinal movement toward and away from the valve seat and provided with a recess, a pin secured in the valve member and extended transversely of said recess, a valve stem rotatably supported by the casing and retained against longitudinal movement and having a slot in one end and said end being slidable in the recess of the valve member with the slot riding on the pin whereby rotation of the valve stem imparts rotary and longitudinal movements to the valve member, the opposite end portion of the valve stem being extended from the casing and provided with a beveled shoulder, and a cap member adjustably mounted on the exterior of the casing and having an opening through which the valve stem is extended and said opening having a beveled face co-operating with the beveled shoulder to exert pressure on the valve stem in the direction of the valve seat, the valve stem being arranged with an annular flange, the casing provided with an annular seat, an O-ring seated in the annular seat and engaged by the annular flange, and means to retain the flange against the O-ring, whereby the engagement between the beveled shoulder of the valve stem and the beveled face of the opening in the cap member forces the valve stem flange into locking engagement '7 with the O-ring andlocks the valve .stem againstrotation.

2. A lock stem valve as claimed in claim 1, wherein the casing is provided with an open chamber in alignment with the inlet port, and a bonnet secured in and closing said chamber, the valve member being adjustably mounted in said bonnet to have rotary and longitudinal movements in the casing chamber, the bonnet being arranged with an annular exterior extension and an annular seat within the base of said annular extension, an O-ring supported by said annular seat, the valve stem having an annular flange abutting said O-ring, and a packing nut adjustably mounted in said annular extension and rotatable on an intermediate portion of the valve stem to engage and retain the annular flange against the O-ring.

3. A lock stern valve as claimed in claim 2, wherein the cap member is adjustably mounted on the annular exterior extension.

4. A lock stem valve as claimed in claim 2, wherein the intermediate portion of the valve stem is of greater diameter than the end portions of the valve stem.

HENRY T.

UNITED STATES PATENTS Hedges 251266 X Bray 25184 X Brown 251--84 X Gibson 251112 X Hochberg 251-84 X Coil 251-111 Rector 251-330 X Uhler 251266 X Pohndorf 251266 X Rogers 25184 X FOREIGN PATENTS 11/1954 Italy.

KLINKSIEK, Primary Examiner U.S. Cl. X.R. 

